tests/test_urcu_rbtree.c

   1 /*
   2  * test_urcu_rbtree.c
   3  *
   4  * Userspace RCU library - test program for RB tree
   5  *
   6  * Copyright February 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #define _GNU_SOURCE
  24 #ifndef DYNAMIC_LINK_TEST
  25 #define _LGPL_SOURCE
  26 #else
  27 #define debug_yield_read()
  28 #endif
  29 #include "../config.h"
  30 #include <stdio.h>
  31 #include <pthread.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <sys/types.h>
  35 #include <sys/wait.h>
  36 #include <unistd.h>
  37 #include <stdio.h>
  38 #include <assert.h>
  39 #include <sys/syscall.h>
  40 #include <sched.h>
  41 #include <errno.h>
  42 #include <time.h>
  43
  44 #include <urcu/arch.h>
  45
  46 extern int __thread disable_debug;
  47
  48 /* hardcoded number of CPUs */
  49 #define NR_CPUS 16384
  50
  51 /* number of insert/delete */
  52 #define NR_RAND 6
  53 //#define NR_RAND 7
  54
  55 #if defined(_syscall0)
  56 _syscall0(pid_t, gettid)
  57 #elif defined(__NR_gettid)
  58 static inline pid_t gettid(void)
  59 {
  60         return syscall(__NR_gettid);
  61 }
  62 #else
  63 #warning "use pid as tid"
  64 static inline pid_t gettid(void)
  65 {
  66         return getpid();
  67 }
  68 #endif
  69
  70 #include <urcu.h>
  71 #include <urcu/rcurbtree.h>
  72 #include <urcu-defer.h>
  73
  74 /* TODO: error handling testing for -ENOMEM */
  75 struct rcu_rbtree_node *rbtree_alloc(void)
  76 {
  77         return calloc(1, sizeof(struct rcu_rbtree_node));
  78 }
  79
  80 void rbtree_free(struct rcu_head *head)
  81 {
  82         struct rcu_rbtree_node *node =
  83                 caa_container_of(head, struct rcu_rbtree_node, head);
  84         free(node);
  85 }
  86
  87 int tree_comp(void *a, void *b)
  88 {
  89         if ((unsigned long)a < (unsigned long)b)
  90                 return -1;
  91         else if ((unsigned long)a > (unsigned long)b)
  92                 return 1;
  93         else
  94                 return 0;
  95 }
  96
  97 static DEFINE_RCU_RBTREE(rbtree, tree_comp, rbtree_alloc, rbtree_free);
  98
  99 static volatile int test_go, test_stop;
 100
 101 static unsigned long wdelay;
 102
 103 static unsigned long duration;
 104
 105 /* read-side C.S. duration, in loops */
 106 static unsigned long rduration;
 107
 108 /* write-side C.S. duration, in loops */
 109 static unsigned long wduration;
 110
 111 static inline void loop_sleep(unsigned long l)
 112 {
 113         while(l-- != 0)
 114                 caa_cpu_relax();
 115 }
 116
 117 static int verbose_mode;
 118
 119 #define printf_verbose(fmt, args...)            \
 120         do {                                    \
 121                 if (verbose_mode)               \
 122                         printf(fmt, args);      \
 123         } while (0)
 124
 125 static unsigned int cpu_affinities[NR_CPUS];
 126 static unsigned int next_aff = 0;
 127 static int use_affinity = 0;
 128
 129 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
 130
 131 #ifndef HAVE_CPU_SET_T
 132 typedef unsigned long cpu_set_t;
 133 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
 134 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
 135 #endif
 136
 137 static void set_affinity(void)
 138 {
 139         cpu_set_t mask;
 140         int cpu;
 141         int ret;
 142
 143         if (!use_affinity)
 144                 return;
 145
 146 #if HAVE_SCHED_SETAFFINITY
 147         ret = pthread_mutex_lock(&affinity_mutex);
 148         if (ret) {
 149                 perror("Error in pthread mutex lock");
 150                 exit(-1);
 151         }
 152         cpu = cpu_affinities[next_aff++];
 153         ret = pthread_mutex_unlock(&affinity_mutex);
 154         if (ret) {
 155                 perror("Error in pthread mutex unlock");
 156                 exit(-1);
 157         }
 158
 159         CPU_ZERO(&mask);
 160         CPU_SET(cpu, &mask);
 161 #if SCHED_SETAFFINITY_ARGS == 2
 162         sched_setaffinity(0, &mask);
 163 #else
 164         sched_setaffinity(0, sizeof(mask), &mask);
 165 #endif
 166 #endif /* HAVE_SCHED_SETAFFINITY */
 167 }
 168
 169 /*
 170  * returns 0 if test should end.
 171  */
 172 static int test_duration_write(void)
 173 {
 174         return !test_stop;
 175 }
 176
 177 static int test_duration_read(void)
 178 {
 179         return !test_stop;
 180 }
 181
 182 static unsigned long long __thread nr_writes;
 183 static unsigned long long __thread nr_reads;
 184
 185 static unsigned int nr_readers;
 186 static unsigned int nr_writers;
 187
 188 static unsigned long global_items;
 189 static void **global_key = NULL;
 190
 191 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 192
 193 void rcu_copy_mutex_lock(void)
 194 {
 195         int ret;
 196         ret = pthread_mutex_lock(&rcu_copy_mutex);
 197         if (ret) {
 198                 perror("Error in pthread mutex lock");
 199                 exit(-1);
 200         }
 201 }
 202
 203 void rcu_copy_mutex_unlock(void)
 204 {
 205         int ret;
 206
 207         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 208         if (ret) {
 209                 perror("Error in pthread mutex unlock");
 210                 exit(-1);
 211         }
 212 }
 213
 214 static
 215 void set_lookup_index(struct rcu_rbtree_node *node,
 216                 char *lookup_hit)
 217 {
 218         int i;
 219
 220         for (i = 0; i < global_items; i++) {
 221                 if (node->begin == global_key[i]
 222                     && !lookup_hit[i]) {
 223                         lookup_hit[i] = 1;
 224                         break;
 225                 }
 226         }
 227 }
 228
 229 void *thr_reader(void *_count)
 230 {
 231         unsigned long long *count = _count;
 232         struct rcu_rbtree_node *node;
 233         int i, index;
 234         char *lookup_hit;
 235
 236         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 237                         "reader", pthread_self(), (unsigned long)gettid());
 238
 239         set_affinity();
 240
 241         rcu_register_thread();
 242
 243         lookup_hit = malloc(sizeof(*lookup_hit) * global_items);
 244
 245         while (!test_go)
 246         {
 247         }
 248         cmm_smp_mb();
 249
 250         for (;;) {
 251                 /* search bottom of range */
 252                 for (i = 0; i < global_items; i++) {
 253                         rcu_read_lock();
 254                         node = rcu_rbtree_search(&rbtree,
 255                                                  rcu_dereference(rbtree.root),
 256                                                  global_key[i]);
 257                         assert(!rcu_rbtree_is_nil(&rbtree, node));
 258                         rcu_read_unlock();
 259                 }
 260
 261                 /* search end of range */
 262                 for (i = 0; i < global_items; i++) {
 263                         rcu_read_lock();
 264                         node = rcu_rbtree_search(&rbtree,
 265                                                  rcu_dereference(rbtree.root),
 266                                                  (void*) ((unsigned long) global_key[i] + 2));
 267                         assert(!rcu_rbtree_is_nil(&rbtree, node));
 268                         rcu_read_unlock();
 269                 }
 270
 271                 /* search range (middle) */
 272                 for (i = 0; i < global_items; i++) {
 273                         rcu_read_lock();
 274                         node = rcu_rbtree_search_range(&rbtree,
 275                                                  rcu_dereference(rbtree.root),
 276                                                  (void*) ((unsigned long) global_key[i] + 1),
 277                                                  (void*) ((unsigned long) global_key[i] + 2));
 278                         assert(!rcu_rbtree_is_nil(&rbtree, node));
 279                         rcu_read_unlock();
 280                 }
 281
 282                 /* search begin key */
 283                 for (i = 0; i < global_items; i++) {
 284                         rcu_read_lock();
 285                         node = rcu_rbtree_search_begin_key(&rbtree,
 286                                                  rcu_dereference(rbtree.root),
 287                                                  global_key[i]);
 288                         assert(!rcu_rbtree_is_nil(&rbtree, node));
 289                         rcu_read_unlock();
 290                 }
 291
 292                 /* min + next */
 293                 memset(lookup_hit, 0, sizeof(*lookup_hit) * global_items);
 294
 295                 rcu_read_lock();
 296                 node = rcu_rbtree_min(&rbtree,
 297                                       rcu_dereference(rbtree.root));
 298                 while (!rcu_rbtree_is_nil(&rbtree, node)) {
 299                         set_lookup_index(node, lookup_hit);
 300                         node = rcu_rbtree_next(&rbtree, node);
 301                 }
 302                 rcu_read_unlock();
 303
 304                 for (i = 0; i < global_items; i++)
 305                         assert(lookup_hit[i]);
 306
 307                 /* max + prev */
 308                 memset(lookup_hit, 0, sizeof(*lookup_hit) * global_items);
 309
 310                 rcu_read_lock();
 311                 node = rcu_rbtree_max(&rbtree,
 312                                       rcu_dereference(rbtree.root));
 313                 while (!rcu_rbtree_is_nil(&rbtree, node)) {
 314                         set_lookup_index(node, lookup_hit);
 315                         node = rcu_rbtree_prev(&rbtree, node);
 316                 }
 317                 rcu_read_unlock();
 318
 319                 for (i = 0; i < global_items; i++)
 320                         assert(lookup_hit[i]);
 321
 322                 debug_yield_read();
 323                 if (unlikely(rduration))
 324                         loop_sleep(rduration);
 325                 nr_reads++;
 326                 if (unlikely(!test_duration_read()))
 327                         break;
 328         }
 329
 330         rcu_unregister_thread();
 331
 332         /* test extra thread registration */
 333         rcu_register_thread();
 334         rcu_unregister_thread();
 335
 336         free(lookup_hit);
 337
 338         *count = nr_reads;
 339         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 340                         "reader", pthread_self(), (unsigned long)gettid());
 341         return ((void*)1);
 342
 343 }
 344
 345 void *thr_writer(void *_count)
 346 {
 347         unsigned long long *count = _count;
 348         struct rcu_rbtree_node *node;
 349         void *key[NR_RAND];
 350         int i;
 351
 352         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 353                         "writer", pthread_self(), (unsigned long)gettid());
 354
 355         set_affinity();
 356
 357         //disable_debug = 1;
 358
 359         rcu_register_thread();
 360
 361         while (!test_go)
 362         {
 363         }
 364         cmm_smp_mb();
 365
 366         for (;;) {
 367                 rcu_copy_mutex_lock();
 368
 369                 for (i = 0; i < NR_RAND; i++) {
 370                         node = rbtree_alloc();
 371                         //key[i] = (void *)(unsigned long)(rand() % 2048);
 372                         key[i] = (void *)(unsigned long)((rand() * 4) % 2048);
 373                         //For more collisions
 374                         //key[i] = (void *)(unsigned long)(rand() % 6);
 375                         node->begin = key[i];
 376                         //node->end = (void *)((unsigned long) key[i] + 4);
 377                         node->end = (void *)((unsigned long) key[i] + 4);
 378                         rcu_read_lock();
 379                         rcu_rbtree_insert(&rbtree, node);
 380                         rcu_read_unlock();
 381                 }
 382                 rcu_copy_mutex_unlock();
 383
 384                 if (unlikely(wduration))
 385                         loop_sleep(wduration);
 386
 387                 rcu_copy_mutex_lock();
 388                 for (i = 0; i < NR_RAND; i++) {
 389 #if 0
 390                         node = rcu_rbtree_min(rbtree, rbtree->root);
 391                         while (!rcu_rbtree_is_nil(&rbtree, node)) {
 392                                 printf("{ 0x%lX p:%lX r:%lX l:%lX %s %s %s} ",
 393                                         (unsigned long)node->key,
 394                                         node->p->key,
 395                                         node->right->key,
 396                                         node->left->key,
 397                                         node->color ? "red" : "black",
 398                                         node->pos ? "right" : "left",
 399                                         node->nil ? "nil" : "");
 400                                 node = rcu_rbtree_next(rbtree, node);
 401                         }
 402                         printf("\n");
 403 #endif
 404                         rcu_read_lock();
 405                         node = rcu_rbtree_search(&rbtree, rbtree.root, key[i]);
 406                         assert(!rcu_rbtree_is_nil(&rbtree, node));
 407                         rcu_rbtree_remove(&rbtree, node);
 408                         rcu_read_unlock();
 409                         call_rcu(&node->head, rbtree_free);
 410                 }
 411
 412                 rcu_copy_mutex_unlock();
 413                 nr_writes++;
 414                 if (unlikely(!test_duration_write()))
 415                         break;
 416                 if (unlikely(wdelay))
 417                         loop_sleep(wdelay);
 418         }
 419
 420         rcu_unregister_thread();
 421
 422         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 423                         "writer", pthread_self(), (unsigned long)gettid());
 424         *count = nr_writes;
 425         return ((void*)2);
 426 }
 427
 428 void show_usage(int argc, char **argv)
 429 {
 430         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 431 #ifdef DEBUG_YIELD
 432         printf(" [-r] [-w] (yield reader and/or writer)");
 433 #endif
 434         printf(" [-d delay] (writer period (us))");
 435         printf(" [-c duration] (reader C.S. duration (in loops))");
 436         printf(" [-e duration] (writer C.S. duration (in loops))");
 437         printf(" [-v] (verbose output)");
 438         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 439         printf("\n");
 440 }
 441
 442 int main(int argc, char **argv)
 443 {
 444         int err;
 445         pthread_t *tid_reader, *tid_writer;
 446         void *tret;
 447         unsigned long long *count_reader, *count_writer;
 448         unsigned long long tot_reads = 0, tot_writes = 0;
 449         int i, a;
 450         struct rcu_rbtree_node *node;
 451
 452         if (argc < 4) {
 453                 show_usage(argc, argv);
 454                 return -1;
 455         }
 456
 457         err = sscanf(argv[1], "%u", &nr_readers);
 458         if (err != 1) {
 459                 show_usage(argc, argv);
 460                 return -1;
 461         }
 462
 463         err = sscanf(argv[2], "%u", &nr_writers);
 464         if (err != 1) {
 465                 show_usage(argc, argv);
 466                 return -1;
 467         }
 468
 469         err = sscanf(argv[3], "%lu", &duration);
 470         if (err != 1) {
 471                 show_usage(argc, argv);
 472                 return -1;
 473         }
 474
 475         for (i = 4; i < argc; i++) {
 476                 if (argv[i][0] != '-')
 477                         continue;
 478                 switch (argv[i][1]) {
 479 #ifdef DEBUG_YIELD
 480                 case 'r':
 481                         yield_active |= YIELD_READ;
 482                         break;
 483                 case 'w':
 484                         yield_active |= YIELD_WRITE;
 485                         break;
 486 #endif
 487                 case 'a':
 488                         if (argc < i + 2) {
 489                                 show_usage(argc, argv);
 490                                 return -1;
 491                         }
 492                         a = atoi(argv[++i]);
 493                         cpu_affinities[next_aff++] = a;
 494                         use_affinity = 1;
 495                         printf_verbose("Adding CPU %d affinity\n", a);
 496                         break;
 497                 case 'c':
 498                         if (argc < i + 2) {
 499                                 show_usage(argc, argv);
 500                                 return -1;
 501                         }
 502                         rduration = atol(argv[++i]);
 503                         break;
 504                 case 'd':
 505                         if (argc < i + 2) {
 506                                 show_usage(argc, argv);
 507                                 return -1;
 508                         }
 509                         wdelay = atol(argv[++i]);
 510                         break;
 511                 case 'e':
 512                         if (argc < i + 2) {
 513                                 show_usage(argc, argv);
 514                                 return -1;
 515                         }
 516                         wduration = atol(argv[++i]);
 517                         break;
 518                 case 'v':
 519                         verbose_mode = 1;
 520                         break;
 521                 case 'g':
 522                         if (argc < i + 2) {
 523                                 show_usage(argc, argv);
 524                                 return -1;
 525                         }
 526                         global_items = atol(argv[++i]);
 527                         break;
 528                 }
 529         }
 530
 531         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 532                 duration, nr_readers, nr_writers);
 533         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 534         printf_verbose("Reader duration : %lu loops.\n", rduration);
 535         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 536                         "main", pthread_self(), (unsigned long)gettid());
 537
 538         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 539         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 540         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 541         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 542         global_key = malloc(sizeof(*global_key) * global_items);
 543
 544         srand(time(NULL));
 545
 546         next_aff = 0;
 547
 548         for (i = 0; i < nr_readers; i++) {
 549                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 550                                      &count_reader[i]);
 551                 if (err != 0)
 552                         exit(1);
 553         }
 554         for (i = 0; i < nr_writers; i++) {
 555                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 556                                      &count_writer[i]);
 557                 if (err != 0)
 558                         exit(1);
 559         }
 560
 561         rcu_register_thread();
 562         rcu_read_lock();
 563         /* Insert items looked up by readers */
 564         for (i = 0; i < global_items; i++) {
 565                 node = rbtree_alloc();
 566                 global_key[i] = (void *)(unsigned long)((rand() * 4) % 2048);
 567                 //global_key[i] = (void *)(unsigned long)(rand() % 2048);
 568                 //For more collisions
 569                 global_key[i] = (void *)(unsigned long)(rand() % 6);
 570                 node->begin = global_key[i];
 571                 //node->end = (void *)((unsigned long) global_key[i] + 1);
 572                 node->end = (void *)((unsigned long) global_key[i] + 4);
 573                 rcu_rbtree_insert(&rbtree, node);
 574         }
 575         rcu_read_unlock();
 576
 577         cmm_smp_mb();
 578
 579         test_go = 1;
 580
 581         sleep(duration);
 582
 583         test_stop = 1;
 584
 585         for (i = 0; i < nr_readers; i++) {
 586                 err = pthread_join(tid_reader[i], &tret);
 587                 if (err != 0)
 588                         exit(1);
 589                 tot_reads += count_reader[i];
 590         }
 591         for (i = 0; i < nr_writers; i++) {
 592                 err = pthread_join(tid_writer[i], &tret);
 593                 if (err != 0)
 594                         exit(1);
 595                 tot_writes += count_writer[i];
 596         }
 597
 598         rcu_read_lock();
 599         for (i = 0; i < global_items; i++) {
 600                 node = rcu_rbtree_search(&rbtree, rbtree.root, global_key[i]);
 601                 assert(!rcu_rbtree_is_nil(&rbtree, node));
 602                 rcu_rbtree_remove(&rbtree, node);
 603                 call_rcu(&node->head, rbtree_free);
 604         }
 605         rcu_read_unlock();
 606         rcu_unregister_thread();
 607
 608         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 609                tot_writes);
 610         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 611                 "nr_writers %3u "
 612                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
 613                 "global_items %6lu\n",
 614                 argv[0], duration, nr_readers, rduration, wduration,
 615                 nr_writers, wdelay, tot_reads, tot_writes,
 616                 tot_reads + tot_writes, global_items);
 617         free(tid_reader);
 618         free(tid_writer);
 619         free(count_reader);
 620         free(count_writer);
 621         free(global_key);
 622         return 0;
 623 }